WordPress/wp-includes/css/wp-pointer.dev.css

.wp-pointer-content {
	padding: 0 10px;
	background: white;
	border: 1px solid #aaa;
	-moz-box-shadow: 0 0 16px rgba( 0, 0, 0, 0.1 );
	-webkit-box-shadow: 0 0 16px rgba( 0, 0, 0, 0.1 );
	box-shadow: 0 0 16px rgba( 0, 0, 0, 0.1 );
}
.wp-pointer-buttons {
	padding: 0 0 10px 0;
	overflow: auto;
}
.wp-pointer-buttons a {
	float: right;
	display: inline-block;
}
/* The arrow base class must take up no space, even with transparent borders. */
.wp-pointer-arrow,
.wp-pointer-arrow-inner {
	position: absolute;
	width: 0;
	height: 0;
}
.wp-pointer-arrow {
	z-index: 10;
}
.wp-pointer-arrow-inner {
	z-index: 20;
}

.wp-pointer-left {
	margin-left: 10px;
}
.wp-pointer-right {
	margin-left: -10px;
}
.wp-pointer-top {
	margin-top: 10px;
}
.wp-pointer-bottom {
	margin-top: -10px;
}

.wp-pointer-left .wp-pointer-arrow,
.wp-pointer-right .wp-pointer-arrow,
.wp-pointer-top .wp-pointer-arrow,
.wp-pointer-bottom .wp-pointer-arrow {
	border: solid 10px transparent;
}

.wp-pointer-left .wp-pointer-arrow {
	border-right-color: #aaa;
	border-left-width: 0;
	right: 100%;
	top: 0;
}
.wp-pointer-right .wp-pointer-arrow {
	border-left-color: #aaa;
	border-right-width: 0;
	left: 100%;
	top: 0;
}
.wp-pointer-top .wp-pointer-arrow {
	border-bottom-color: #aaa;
	border-top-width: 0;
	left: 0;
	bottom: 100%;
}
.wp-pointer-bottom .wp-pointer-arrow {
	border-top-color: #aaa;
	border-bottom-width: 0;
	left: 0;
	top: 100%;
}

.wp-pointer-left .wp-pointer-arrow-inner,
.wp-pointer-right .wp-pointer-arrow-inner,
.wp-pointer-top .wp-pointer-arrow-inner,
.wp-pointer-bottom .wp-pointer-arrow-inner {
	border: solid 9px transparent;
}

.wp-pointer-left .wp-pointer-arrow-inner {
	border-right-color: #fff;
	border-left-width: 0;
	top: -9px;
	left: 2px;
}
.wp-pointer-right .wp-pointer-arrow-inner {
	border-left-color: #fff;
	border-right-width: 0;
	top: -9px;
	right: 2px;
}
.wp-pointer-top .wp-pointer-arrow-inner {
	border-bottom-color: #fff;
	border-top-width: 0;
	top: 2px;
	left: -9px;
}
.wp-pointer-bottom .wp-pointer-arrow-inner {
	border-top-color: #fff;
	border-bottom-width: 0;
	bottom: 2px;
	left: -9px;
}